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Old 12-18-2012, 12:54 AM
charlie90262 charlie90262 is offline
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03 navigator engine coolant temperature problem

hello fellow members this is my 1st post and in need of help i have a 03 navigator 5.4 3v im getting a check engine light code p0117 i changed thermostat and 2 sensors one in back of pass hed and the other one next to the themostat . cooling gauge goes half way and then it just dies auto zone gave me this sensor part number # SU8781 its lite brown with 2 wire clip i been looking and just cant find nothing thx for ur help in advance
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Old 12-18-2012, 01:25 PM
pdqford pdqford is offline
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Originally Posted by charlie90262 View Post
im getting a check engine light code p0117 i changed thermostat
I'm not sure changing the thermostat will fix your check engine light. The P0117 is the computers way of telling you that the voltage on the ECT (Engine Coolant Temperature) sensor circuit was too low (i.e, less than 0.2V) for normal operation. That would indicate a temp of over 250 degrees F. Did your Navigator overheat at some time?

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Originally Posted by charlie90262 View Post
i changed thermostat and 2 sensors one in back of pass hed and the other one next to the themostat .
Sounds like you changed both the CHT (Cylinder Head Temperature) sensor as well as the ECT (Engine Coolant Temperture) sensor.

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Originally Posted by charlie90262 View Post
cooling gauge goes half way and then it just dies
Could you elaborate on what you mean that it 'just dies'?

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Originally Posted by charlie90262 View Post
auto zone gave me this sensor part number # SU8781 its lite brown with 2 wire clip
Did auto zone say what kind of a sensor it was?
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Old 12-18-2012, 01:37 PM
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khadma khadma is offline
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Duralast/Oil Temperature Switch (SU8781) | AutoZone.com

What was the other switch's part number?

Also, did you disconnect the negative battery cable before

Replacing switches/sensors?
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Old 12-18-2012, 11:56 PM
charlie90262 charlie90262 is offline
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the needle for the temp goes half ways and just dies goes down and i get check engine light on with the coolant light on and code p0117
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Old 12-18-2012, 11:59 PM
charlie90262 charlie90262 is offline
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http://www.autozone.com/autozone/par...631220_0_18589_
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Old 12-19-2012, 12:01 AM
charlie90262 charlie90262 is offline
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thats the sensor they gave me and from what i heard from my friend that coolant sensor goes inside the oil pan and from what i been googling the cooling sensor 2 wire harnest gets messt up thx guy for all ur help
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Old 12-19-2012, 09:53 AM
pdqford pdqford is offline
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i have a 03 navigator 5.4 3v
Are you sure its a 3-valve engine? What is the eighth digit of the VIN?
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'79 2WD F-150 Lariet w/302,4spd OD, 228,965 mi. (Original Owner!)
'02 4X4 Navigator w/5.4L DOHC 32v Intech V-8 (VIN R).
http://www.fuelly.com/sig-us/50500.png
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Old 12-19-2012, 10:49 AM
pdqford pdqford is offline
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Quote:
Originally Posted by charlie90262 View Post
i heard from my friend that coolant sensor goes inside the oil pan
How is the coolant sensor going to sense the coolant temp if the sensor is located in the oil pan
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Jim in Central NY
'79 2WD F-150 Lariet w/302,4spd OD, 228,965 mi. (Original Owner!)
'02 4X4 Navigator w/5.4L DOHC 32v Intech V-8 (VIN R).
http://www.fuelly.com/sig-us/50500.png
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Old 12-19-2012, 11:18 AM
pdqford pdqford is offline
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Quote:
Originally Posted by charlie90262 View Post
the needle for the temp goes half ways and just dies goes down and i get check engine light on with the coolant light on and code p0117
Sounds to me then that the PCM is indicating that it is not receiving a valid voltage from the ECT sensor. Normally the PCM sends coolant information over the SCP (Standard Corporate Protocol) network and would be picked up by the HEC (Hybrid Electronic Cluster, aka Instrument Cluster), processor. If the HEC doesn't receive coolant info every so many seconds from the PCM, it doesn't know where to command the temp gauge needle to point.

The Navigator runs three different networks to support communication between the various electronic modules. All three networks are accessable through the DLC. I think your gonna need a scan tool that can read U codes to see if you are having an issue with network communications and/or run a self test on the HEC to see if it is having issues controling the virtual temp gauge.

I'm afraid that this is beyond my pay grade
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'79 2WD F-150 Lariet w/302,4spd OD, 228,965 mi. (Original Owner!)
'02 4X4 Navigator w/5.4L DOHC 32v Intech V-8 (VIN R).
http://www.fuelly.com/sig-us/50500.png
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Old 12-19-2012, 11:18 AM
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